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However, the excessive transient current may damage the drive circuit and threaten the system safety. Besides, it is also important to pay attention to the influence of multiple disturbances including system parameter uncertainties and unknown load torque variation. To solve these problems, we propose a nonlinear speed-tracking control approach for uncertain PMSM systems. More specifically, based on the cascade control structure and by introducing auxiliary smooth function, we first develop a nonlinear current-constrained controller (CCC) to guarantee the speed tracking, disturbance rejection, and overcurrent protection simultaneously. In order to improve the robustness of the desired performances, we further implement extended state observer (ESO) techniques to propose an ESO-based CCC (ESO-CCC). Finally, comparative experiments are implemented in a 5.5\u2009kW PMSM platform to verify the performance of the proposed two controllers.<\/jats:p>","DOI":"10.1177\/01423312231185387","type":"journal-article","created":{"date-parts":[[2023,7,12]],"date-time":"2023-07-12T07:17:56Z","timestamp":1689146276000},"page":"666-677","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Nonlinear speed-tracking control with overcurrent protection for uncertain permanent magnet synchronous motor systems"],"prefix":"10.1177","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8474-5250","authenticated-orcid":false,"given":"Jianyi","family":"Zhang","sequence":"first","affiliation":[{"name":"The Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education, Dalian University of Technology, 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